A lot of atheists keep up their ancestral Jewish traditions and culture. We can certainly keep up some of our Christian heritage too. Even the ones stolen from pagans.
All of these traditions are monstrous hybrids anyway, with multiple complex and interacting roots from many cultures. Associating them fully with the religion that currently claims ownership is an error. So it matters not whether you choose to top your tortuously executed spruce with an angel, the star of Bethlehem, fluffy Paramecium, or a painstakingly crafted Elder Thing.
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